
Although I've already listed all of these tracks and their uses over at the Gumball Fandom wiki, I still felt inclined to finally make a thread here, specifically for those who don't have time to shuffle through all the episode articles.
ALIBI Music
Elgar-Pomp and Circumstance - Charles Berry [removed from ALIBI site]
Hard Bodies - Jeff Dodson
Audio Network
8 Bit Disco 2 - Philip Guyler
Abuse - Bob Bradley
Alien Dawn Full - Chris Blackwell
All's Right - David Kelly
Bathed In Blood - Jason Bowld, Colin Doran
Battle Call 6 - Patrick Hawes
Battle Call 10 - Patrick Hawes
Battle Stations 3 - Patrick Hawes
Big Bazookas - Chris Egan, Trystan Francis
Big Bazookas 4 - Chris Egan, Trystan Francis
Big Bazookas 6 - Chris Egan, Trystan Francis
Big Bazookas 14 - Chris Egan, Trystan Francis
Big Bazookas 16 - Chris Egan, Trystan Francis
Big Bazookas 20 - Chris Egan, Trystan Francis
Blue Danube 10 - Johann Strauss, Julian Gallant, David Tobin, Jeff Meegan
Celebrated Minuet - Luigi Boccherini, Julian Gallant, David Tobin, Jeff Meegan
Celtic Landscape - Paul Mottram
Citonault Pipo 18 - John Fleming
Clowns In Cars - Frank Mizen, Daniel Mizen, Miles Gilderdale, Christopher Norton
Crazy Like Me 21 - David Tobin, Jeff Meegan, Tim Garland
Creepy Crawlies 2 - Jeff Meegan, David Tobin
Crime Ring 5 - Andrew Cottee
Crime Ring 8 - Andrew Cottee
Daisy Bell - Paul Harris, Alexander Armstrong
Day of Anger - Giuseppe Verdi, Julian Gallant, Jeff Meegan, David Tobin, Rob Kelly
Dies Irae - James Brett
Disclosures 2 - Mike Stobbie
Do Da Damn Thing 3 - Igor Dvorkin, Deon Bayley, Adrian Francis
Dona Nobis 3 - James Brett
Enchanted Isle - Debbie Wiseman
End of the Road - Ian Hughes
Epic Journey - David Tobin, Jeff Meegan, Malcolm Edmonstone
Fate 6 - Giuseppe Verdi, Julian Gallant, Jeff Meegan, David Tobin, Rob Kelly
Fate 7 - Giuseppe Verdi, Julian Gallant, Jeff Meegan, David Tobin, Rob Kelly
Floating Spirit - Christophe Goze
Flower Duet - Leo Delibes, Jeff Meegan, Julian Gallant, David Tobin
Flowering Power - Christian Marsac
Fortune My Foe - Paul Mottram
Freeze Sucka - David Tobin, Jeff Meegan, Freddie Gavita
From Valor To Glory 5 - Terry Devine-King
Gloomy Waters 15 - Skaila Kanga, Chris Egan
Good King Wenceslas - Simon Anderson
Happy Bones - Paul Mottram
Hell On Earth - Terry Devine-King
Hidden Pearl - Tom Quick
I'm Ready For Love - Chris Bussey, Craig Bussey, Annie Drury
Impending Doom - David Tobin, Jeff Meegan
Jerusalem 3 - William Blake, Hubert Parry, David Tobin, Jeff Meegan, Julian Gallant
Koi No Radio - Bob Bradley, Erik Reiff
Lacrimosa 6 - James Brett
Land of Make Believe 5 - Ray Davies
Lullaby Brahms 3 - Paul Mottram
March To the Camp - Paul Mottram
March To the Motherland 7 - Alexander L'Estrange, Ben Parry
Me Before You 9 - Skaila Kanga, Chris Egan
Minuet For Strings - Ray Davies
Moldova Wedding 2 - Romani Rad
Morning - Edvard Grieg, David Tobin, Jeff Meegan, Julian Gallant
Mother Ship Attack - Chris Egan, William Cooksley
Mother Ship Attack 13 - Chris Egan, William Cooksley
Mother Ship Attack 17 - Chris Egan, William Cooksley
Motion Notion 4 - John Fleming
Ode To Joy - Ludwig Beethoven, Jeff Meegan, Julian Gallant, David Tobin
One of Those Days - Igor Dvorkin, Duncan Pittock
Oppression 7 - Matt Hill
Padded Shoulders - Igor Dvorkin, Duncan Pittock
Pastoral Idyll - Patrick Hawes
Perfect Smile 14 - Tom Peters, Lorenzo De Feo
Play It Again Francisco - Tim Devine, Francisco Renno
Presto Overture - Wolfgang Mozart, Julian Gallant, Jeff Meegan, David Tobin, Rob Kelly
Prime Rib - Adam Drake, Neil Williams
Prophecy - Dan Skinner, Adam Skinner
Remember the Day - Adam Drake, Tom Jenkins
Roly Poly Tuba 11 - Tom Briers
Russian Paddlers - Igor Dvorkin, Bibs Ekkel, Ellie Kidd
Selfie Stick - Lincoln Grounds, Thomm Jutz
Serpent - Tim Garland
Sewer Spider 8 - Ceiri Torjussen
Sovereign Annexe - Pete Davis, James Banbury
Spirit 6 - Terry Devine-King
Storm Warning - David O'Brien
Summer Lullaby - Will Cookson
Super Powers - Chris Egan, Luke Richards
Superheroes - Chris Egan
Superheroes 5 - Chris Egan
Superheroes 7 - Chris Egan
Swashbuckler 8 - Paul Mottram
Swashbuckler 9 - Paul Mottram
Swashbuckler 10 - Paul Mottram
Swirling Spiders - David Tobin, Jeff Meegan, Huw White
Temple Garden - David O'Brien, Paul Clarvis
Told Ya So 6 - Chris Norton, Frank Mizen
Touch Screen - Barrie Gledden, Kes Loy
Traveling Troubadours - Chris Egan
Turbulent Seas - Ian Hughes
Un Bel Di - Giacomo Puccini, David Tobin, Jeff Meegan, Julian Gallant
Un Bel Di 8 - Giacomo Puccini, David Tobin, Jeff Meegan, Julian Gallant
Undercover Agent 2 - Bob Bradley, Chris Egan
Valse Soupee - David Weston
Wedding March - Christian Marsac
Whoops - Steve Sidwell
Winter Skies 2 - William Cookson
Wishes - Sam Wedgwood
Work That Body - Dave James
You Should Have Killed Me 2 - Lincoln Grounds, Randall Breneman
Black Is Blonde
Eat Me - Joachim Tospann
Deep East Music
Movies Alone Are Ace - Selwyn Froggit, Martin Winning
In the Groove
Into the Dark - Jesse Kwakenat, Nathan Nelson
Strongarm (Rock Solo) - Drew Lerdal
Intervox
Anesthetic (:15 Edit) - Thomas Strasser
Bamboo Hut - Matthias Ruckdaeschel
Big Circus (:30 Edit) - Quirin Amper Jr., Fred Strittmatter
Entrance of the Gladiators - Gert Wilden
Fatal Chase - Pavel Ruzicka, Petr Dvorak
Magic Meditation 6 - Stan Regal
Jingle Punks
1984 v1-JP - Stuart Moore
A Little More Hope-JP - Xiaotian Shi
A Step Into Infinity-JP - Stefano Mastronardi [removed from Jingle Punks catalogue]
A Sweet Sorrow-JP - Robert Mete
A Tragic Mess-JP - Cody Westheimer [removed from Jingle Punks catalogue]
Abcdefg-JP - Jonathan Preston [not on Slipstream site]
Adventure Island Park-JP - Sam Clunie
Almost Time Alt-JP - Cody Westheimer [removed from Jingle Punks catalogue]
Always Keep Movin-JP - Luke Silas
Autumn Skies Bed 60 - Jeff Franzel
Bach Cello Prelude In G-JP - David Hewitt
Back Home 15 - Greg Herzenach, Alan Wolovitch
Beautiful Acoustic Bed - Josh Heineman, Mitch Stein
Beethoven Symphony No 5 Movement 1-JP - Jared Reed
Bombastic Climax 30 B-JP - Christopher Fuller [not on Slipstream site]
Bossa Lounge-JP - Simon Wilkinson [removed from Jingle Punks catalogue]
Bright New Day 001-JP - Darko Saric [not on Slipstream site]
Calamityville Primary School Band Blues-JP - Brenton White
Carcassi Study No 1-JP - Abbas Premjee
Cherry Punch 05-Instr-JP - Joseph Vassallo [not on Slipstream site]
Choir Awe Alt 1 - David Bramfitt
Choir of Epicness-JP - Seth Littlefield
Chris Christ Sting-JP - Rudi Schlamp
Chrono Triggers Final Fantasy-JP - Lee Weinberg
Clubby House Groove Alt-JP - Andrew Wysong
Dark and Low Reveal - Richard Smith, Jared Gutstadt
Dark Days of War-JP - Bobby Cole
Dawn of Motivational Speaking-JP - Christopher Fuller
Dies Irae-JP - David Hewitt
Digital Driver-JP - Kevin Gardner
Dim the Lights 001-JP - Kyle Ryan
Distant Desires-JP - Cody Westheimer [removed from Jingle Punks catalogue]
Dogs Dinner-JP - John Hyde
Electric Slap Bass 30-HK - Alan Cummins
Electric Swamp Sting 5-JP - Lawrence Nachsin
Electro Movie-JP - Marshall Smith, Thomas Fox [removed from Jingle Punks catalogue]
Enchanted Evening-JP - Lee Brooks [not on Slipstream site]
The Fish Ate My Honey-JP - Cody Westheimer [removed from Jingle Punks catalogue]
Former Spy Sting-JP - Geoffrey Smith
Fugitive Pursuit Less Synth-JP - Christopher Hodges
G and B Sting One-JP - Rolf Schnyder
Got To Have It - Scott Goodman, Daniel Stein
Groceries-JP - Jesse Billson [removed from Jingle Punks catalogue]
Hail To the Chief Traditional No Perc - Jeffrey Peters, Jared Gutstadt
Here To Stay 005-Instr-JP - Amanda Fama
Here To Stay 005-JP - Amanda Fama
Heroica - Didier Rachou
Holy Smoke-JP - Daniel Phillips
Honky Tonkin Baby-JP - Stephen Donnelly, Sean Oliver
I Vow-JP - Curtis Clark
In the Name of 15-JP - Sean Hayden
Industrial Terror-JP - Robert Valenti, Shannon Valenti
Infinite Wonder - Steven Page, Jared Gutstadt
Ipanema Breeze 001-JP - Stephen Rice
Irish Washerwoman - Scott Goodman, Kevin Bluhm
Jar Pickles-JP - Cynthia Visperas [not on Slipstream site]
Jingle the Indie Blues Bells Sting-JP - Martin Holm
Kings of Old-JP - Bryan Steele
Kirbys Treehouse - Adam Brodsky, Jared Gutstadt
Lemonade Pie 15-Instr-JP - Joseph Vassallo [not on Slipstream site]
Lemonade Pie Loop2-Instr-JP - Joseph Vassallo [not on Slipstream site]
Lovers and Piano-JP - Pierre Cohen
Medieval Times-JP - Dustin Crenna
Memories In Your Beautiful Sad Eyes-JP - Joel Wallach
No Staplers No Cherry Bombs-JP - Kyle Corcoran
The Number One Catch Instr - Jared Gutstadt, Luke Silas
Ode To Joy Longer - Jared Gutstadt, Jeffrey Peters
Pachelbels Canon-JP - Johann Pachelbel, Anne Pfeiffer [not on Slipstream site]
Pearl To Die For No Perc-JP - Anand Gan, Doug Davis
The Pennywhistle Arcade-JP - Martin Spitznagel
Planetary Rings-JP - Kevin Gardner
Playtime 004-JP - Damien Heartwell
Prelude In Db Major No. 15-Raindrop-JP - Frederic Chopin, NJ Currie
Purplepreset-JP - Gregory Reeves
Ripples of Lost Love-JP - Xiaotian Shi
Save It V1 - Jared Gutstadt, Malcolm Flythe
Saxony Concerto No. 1 - Miranda Sachetta, Jared Gutstadt
Silly Billy-JP - Denis Woods [removed from Jingle Punks catalogue]
Spiralis-JP - Craig Dodge
Squealer-JP - J B Markham
Star Spangled Banner - Jared Gutstadt, Jordan Sears
Step Up Bro-JP - Sean Hurwitz, Louis Yoelin
Sting 2 Drama Suspense-JP - Daniel Shklair
Sultry Slow Solo Sax 3-JP - John Boegehold
Sultry Slow Solo Sax 4-JP - John Boegehold
Sunny La Las-JP - Angela Predhomme
Sunshine-v99-JP - Darko Saric [not on Slipstream site]
Supernova 004-JP - Justin Crosby
Time Machine-JP - Lukas Kaiser
Trailer Bramming-JP - Lawrence Nachsin
The Tread-92-JP - James Levine
The Tread-121-JP - James Levine
Tropical Woodland-JP - Andrew Gannon [not on Slipstream site]
Turn It Up 002 Sting C-JP - Kevin Baumgard
Tv Blues Sting 1-JP - Kurt Borst, Stefan Moessle [not on Slipstream site]
Underground 002-JP - James Hall
Venice In Early June-JP - John Boegehold
Wheelhouse-JP - Kevin Afflack
When the Going Gets Tough Sting - Dorian Charnis
Winter Night-JP - Jarno Huhtanen
Wreck Room - Thomas Hazerian, Eric Cunningham, Chris Lang
Yes Sir Lets Boogie 60-JP - John Hyde
Megatrax
1000 Corpses - Hanu Khosla, Manu Khosla
Action Drop (End Stinger) - Wayne Coster
Angelic Aah (Alt. Mix (Choir Only, Shorter, Key of Eb)) - Ronald Mendelsohn
All Torn Up - Daniel Cross
The Band Played On (Faster Tempo) - Charles Ward, John Palmer, Charles Blaker, Kevin Hiatt
Bossa Baby - Roger Burn, William Bergman
Champion's League (:30 Full Mix) - John Dwyer
Choral Risers - Frederick Kron, Tal Bergman
Clair De Lune (Debussy) - Claude Debussy, Ronald Mendelsohn
Climactic Accelerator - Frederick Kron
Confidentially Yours - Charles Blaker, Kevin Hiatt
Distorted World - Steve Williams
Dreamy Moment - Patrice Irving
Funeral March (Slower Tempo) - Frederic Chopin, Charles Blaker, Kevin Hiatt
Glorious Homecoming (:15 Edit) - Ronald Mendelsohn
Graceful Planet - Ariel Blumenthal
Heaven and Earth - Jeff Edwards, William Bergman
Magical Adventure (Alt. Edit (End Section)) - Harvey Cohen
Mortal Conflict (:60 Full Mix) - Frederick Kron
News From Around the World - Jon Kull
Night On Bald Mountain (Mussorgsky) - Modest Mussorgsky, John Dwyer, Ronald Mendelsohn
Poquito Mas - Roni Skies, William Bergman
Rise of the Falcon - Todd Haberman
Romeo and Juliet Love Theme (Tchaikovsky) - Peter Tchaikovsky, John Dwyer, Ronald Mendelsohn
Rule Britannia - Thomas Arne, David Mallet, James Thomson, Charles Blaker, Kevin Hiatt
Screeching Vermin - Ronald James
Si Senor! (Yes Sir!) - Enrique Carbajal, Rene Brizuela
Sitcom Link (Alt.) [#33.3] - Kevin Hiatt
Snuggly Buggly - Patrice Irving
Soap Link - Kevin Hiatt
Survival Games - Frederick Kron
The Tempest - Peter Tomashek
Warsaw Requiem (A Cappella Choir) - John Dwyer, Ronald Mendelsohn
Music Beyond
Washington Post - John Sousa, Stix Randolph
No Sheet Music
Forboden - Glyn Owen
Songs To Your Eyes
Beautiful Minds - Kathy Talbot
Sound Adventures
Atmospheric Pressure - Steve Williams
Sound Ideas
Music, Box - Small Music Box: Rock A Bye Baby
VideoHelper
Got You On the Dance Floor - Brian Randazzo